The Thousand-Pulsar-Array programme on MeerKAT - V. Scattering analysis of single-component pulsars
<p>We have measured the scattering time-scale, τ, and the scattering spectral index, α, for 84 single-component pulsars. Observations were carried out with the MeerKAT telescope as part of the Thousand-Pulsar-Array programme in the MeerTime project at frequencies between 0.895 and 1.670 GHz. O...
| Main Authors: | , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
Oxford University Press
2021
|
| _version_ | 1797109371545583616 |
|---|---|
| author | Oswald, LS Karastergiou, A Posselt, B Johnston, S Bailes, M Buchner, S Geyer, M Keith, MJ Kramer, M Parthasarathy, A Reardon, DJ Serylak, M Shannon, RM Spiewak, R van Straten, W Krishnan, VV |
| author_facet | Oswald, LS Karastergiou, A Posselt, B Johnston, S Bailes, M Buchner, S Geyer, M Keith, MJ Kramer, M Parthasarathy, A Reardon, DJ Serylak, M Shannon, RM Spiewak, R van Straten, W Krishnan, VV |
| author_sort | Oswald, LS |
| collection | OXFORD |
| description | <p>We have measured the scattering time-scale, τ, and the scattering spectral index, α, for 84 single-component pulsars. Observations were carried out with the MeerKAT telescope as part of the Thousand-Pulsar-Array programme in the MeerTime project at frequencies between 0.895 and 1.670 GHz. Our results give a distribution of values for α (defined in terms of τ and frequency ν as τ ∝ ν<sup>−α</sup>) for which, upon fitting a Gaussian, we obtain a mean and standard deviation of 〈α〉 = 4.0 ± 0.6. This is due to our identification of possible causes of inaccurate measurement of τ, which, if not filtered out of modelling results, tend to lead to underestimation of α. The pulsars in our sample have large dispersion measures and are therefore likely to be distant. We find that a model using an isotropic scatter broadening function is consistent with the data, likely due to the averaging effect of multiple scattering screens along the line of sight. Our sample of scattering parameters provides a strong data set upon which we can build to test more complex and time-dependent scattering phenomena, such as extreme scattering events.</p> |
| first_indexed | 2024-03-07T07:40:57Z |
| format | Journal article |
| id | oxford-uuid:6eade014-b1f8-4608-b195-652f7b1106d0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:40:57Z |
| publishDate | 2021 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:6eade014-b1f8-4608-b195-652f7b1106d02023-04-21T13:53:47ZThe Thousand-Pulsar-Array programme on MeerKAT - V. Scattering analysis of single-component pulsarsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6eade014-b1f8-4608-b195-652f7b1106d0EnglishSymplectic ElementsOxford University Press2021Oswald, LSKarastergiou, APosselt, BJohnston, SBailes, MBuchner, SGeyer, MKeith, MJKramer, MParthasarathy, AReardon, DJSerylak, MShannon, RMSpiewak, Rvan Straten, WKrishnan, VV<p>We have measured the scattering time-scale, τ, and the scattering spectral index, α, for 84 single-component pulsars. Observations were carried out with the MeerKAT telescope as part of the Thousand-Pulsar-Array programme in the MeerTime project at frequencies between 0.895 and 1.670 GHz. Our results give a distribution of values for α (defined in terms of τ and frequency ν as τ ∝ ν<sup>−α</sup>) for which, upon fitting a Gaussian, we obtain a mean and standard deviation of 〈α〉 = 4.0 ± 0.6. This is due to our identification of possible causes of inaccurate measurement of τ, which, if not filtered out of modelling results, tend to lead to underestimation of α. The pulsars in our sample have large dispersion measures and are therefore likely to be distant. We find that a model using an isotropic scatter broadening function is consistent with the data, likely due to the averaging effect of multiple scattering screens along the line of sight. Our sample of scattering parameters provides a strong data set upon which we can build to test more complex and time-dependent scattering phenomena, such as extreme scattering events.</p> |
| spellingShingle | Oswald, LS Karastergiou, A Posselt, B Johnston, S Bailes, M Buchner, S Geyer, M Keith, MJ Kramer, M Parthasarathy, A Reardon, DJ Serylak, M Shannon, RM Spiewak, R van Straten, W Krishnan, VV The Thousand-Pulsar-Array programme on MeerKAT - V. Scattering analysis of single-component pulsars |
| title | The Thousand-Pulsar-Array programme on MeerKAT - V. Scattering analysis of single-component pulsars |
| title_full | The Thousand-Pulsar-Array programme on MeerKAT - V. Scattering analysis of single-component pulsars |
| title_fullStr | The Thousand-Pulsar-Array programme on MeerKAT - V. Scattering analysis of single-component pulsars |
| title_full_unstemmed | The Thousand-Pulsar-Array programme on MeerKAT - V. Scattering analysis of single-component pulsars |
| title_short | The Thousand-Pulsar-Array programme on MeerKAT - V. Scattering analysis of single-component pulsars |
| title_sort | thousand pulsar array programme on meerkat v scattering analysis of single component pulsars |
| work_keys_str_mv | AT oswaldls thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT karastergioua thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT posseltb thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT johnstons thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT bailesm thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT buchners thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT geyerm thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT keithmj thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT kramerm thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT parthasarathya thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT reardondj thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT serylakm thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT shannonrm thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT spiewakr thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT vanstratenw thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT krishnanvv thethousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT oswaldls thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT karastergioua thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT posseltb thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT johnstons thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT bailesm thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT buchners thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT geyerm thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT keithmj thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT kramerm thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT parthasarathya thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT reardondj thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT serylakm thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT shannonrm thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT spiewakr thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT vanstratenw thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars AT krishnanvv thousandpulsararrayprogrammeonmeerkatvscatteringanalysisofsinglecomponentpulsars |